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F. c. KELLER AND RLA. SHARP. UNIVERSAL FUEL BOILER.

APPLICATION FILED JULYZI, 1919.

1 21,922. Patented Nov. 18', 1919.

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1 k w wq 3 x INVENTORS WITNESS. F1 EKEHer ATTORNEYQ F. C. KELLER AND R.A. SHARP.

UNIVERSAL FUEL BOILER- APPLICATION FILED JULYZI. 1919.

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FRED C. KELLER AND RICHARD A. SHARP, 0F MILWAUKEE, WISCONSIN; ASSIGNORSTO MILWAUKEE RELIANCE BOILER WORKS, 0F MILWAUKEE, WISCONSIN, A CORPORA-TION OF WISCONSIN.

UNIVERSAL FUEL-BOILER.

Application filed July 21, 1919.

To all whom it may concern:

Be it known that we, FRED C. KELLER and RICHARD A. SHARP, citizens ofthe United States, and residents of Milwaukee, in the county ofMilwaukee and State of Viscousin, have invented certain new and usefulImprovements in Universal Fuel-Boilers;

and we do hereby declare that the following is a full, clear, and exactdescription thereof.

Our invention relates to new and useful improvements in boilers forgenerating steam, and more particularly of a light and portable typeadapted to be set up in a shop or garage to supply steam for variouspurposes.

It is in general the object of our invention to simplify and render morecompact and durable the structure of boilers of this character and toincrease the range of adaptability of such boilers.

It is an important object of our invention to provide a boiler of thischaracter haw ing units thereof adapted for use either with solid fuelor with fluid fuel, and wherein certain parts of the boiler structuremay be discarded in the use of the boiler for fluid fuel, such as oil orgas.

A further and important object of our invention resides in the provisionof a boiler structure of this character which may be constructed in amost economical manner to provide readily assembled and disassembledunits.

With the above and other objects and advantages in view, which will beapparent as the description proceeds, our invention resides in the novelfeatures of construction, combination and arrangement of parts whichwill be hereinafter more particularly described and defined by theappended claims.

In the accompanying drawings:

Figure 1 is a side elevational view of a boiler constructed inaccordance with our invention and adapted for burning solid fuel, oneside portion of the boiler structure being broken away.

Fig. 2 is a side elevational view of the boiler adapted only for burningfluid fuel.

Fig. 3 is a transverse sectional view through the boiler on the line 33of Fig. -1.

Referring now more particularly to the drawings, our improved boilerwhen adapted for burning solid fuel, comprises an up per water and steamchamber A, an inter- Specification of Letters Patent.

Patented Nov. 18, 1919.

Serial No. 312,322.

mediate lire chamber B and an ash pit chamber C.

The upper chamber A is formed of a cylindrical casing wall 5 of sheetmetal, and it is closed at its upper end by an upper tube sheet Ghavingits peripheral end portion turned to provide an upstanding flange 7which is disposed in the upper portion of the cylindrical wall 5 andsecured thereto by rivets 8, the upper edge of the flange being spacedbelow the upper edge of the wall 5, and the tube sheet 6 being disposeda considerable distance below the wall to form a breeching space. Thelower end of the chamber A is closed by a lower tube sheet 9 which hasits peripheral edge portion turned to provide an upstanding annularflange 10 disposed within the lower portion of the wall 5 and securedthereto by a series of rivets 11, the plate 9 and the lower portion ofthe flange 10 being disposed below the lower edge of the wall 5 and thusform ing the coniiecting means for the peripheral casing wall 12 of thefire chamber B, which is of the same diameter as the wall 5 and whichsnugly receives the lower portion of the flange 10 to hold the wallsections 5 and 12 in abutting relation. An annular fire backing isdisposed within the wall 12 of the fire chamber and comprises aplurality of arcuate sections 13 held by spacer blocks 1 1 in spacedrelation to the annular wall 12 and having their end faces disposed inplanes extending radially of the chamber to procure proper abuttingrelation of said end faces. and to mutually prevent inward displacementof the sections. The sections 13 are formed of suitable castings and areof lesser height than the sheet metal wall 12 to provide space for thebottom tube sheet 9, which seats on said sections 13. The ash pitchamber C isformed by a cylindrical sheet metal casing wall 15 equal indiameter to the walls 11 and 12, but of 0011- siderably lesser heightthan either wall and a grate annulus 16 of cast metal seats on this walland affords in turn a seat for the fire chamber wall 12 and backingsections 13, the outer portion of said grate annulus being provided withannular flanges 17 to hold the parts against lateral movement. Thisgrate annulus is provided with journal recesses 18 open at the top ofthe an nulus for receiving the pintles of a series of grate sections 19,which are preferably of any conventional nature, the pintles beingretained in the recesses by the seating engagement of the fire chamberportions on the grate annulus. The ash pit wall 15 seats in the upturnedperipheral flange portion of a base plate 20 formed of sheet metalsimilar to the chamber walls. This wall 15 is also provided with asuitable ash and draft door 21 and the fire chamber wall 12 is providedwith the usual door 22.

Fire tubes 23 extend between and connect the tube sheets 6 and 9 of thesteam and water chamber A, and a cover section 24, provided with asuitable outlet 25, has a depending peripheral flange portion engageablein the upper edge portion of the wall 5 to form a breeching for thec0mbus tion gases. The chamber A is provided with a water gage w, apressure gage p and any suitable safety device 8, these parts being innowise pertinent to the invention. Steam is conveyed from the chamber Aby a pipe 26, and water may be supplied to the chamber in any suitablemanner.

lVe have thus described an exceedingly simple, compact and eiiicientboiler structure which may be formed mainly of sheet metal sections andwhich comprises a plurality of readily separable units whereby theboiler structure may be most readily moved from place to place and setup as desired, the units being held in assembled relation by the variousinterlocking connections procured in setting the units one upon theother. 7

When solid fuel, such as wood or coal is used in the boiler, the entirestructure described is used. In some instances, howi ever, it may bedesirable to use fluid fuel,

such as oil or gas, and in this instance the grate and ash pit structuremay be eliminated, and it Will be particularly noted that by mydetachable relation of parts and by forming the Wall sections 12 and 15equal in diameter, the wall sections 15 and grate annulus may be simplyremoved and the fire chamber structure seated directly on the base plate20.

What is claimed is:

1. A boiler of the class described including an upper cylindrical sheetmetal section, an upper tube sheet closing the upper portion of saidcylindrical section, a lower tube sheet having its peripheral portionupwardly turned to form an annular flange secured within said uppercylindrical section, said flange projecting below the bottom of saidupper cylindrical section, fire tubes extending between the tube sheets,a lower Cylindrical sheet metal section equal in diameter tothe uppersection and receiving the lower tube sheet and flange, and fire backingsections disposed within and spaced from the lower cylindrical sections,said fire backing sections being oi lesser height than the lowercylindrical section and seating the lower tube sheet.

2. A boiler of the class described comprising a base plate having anupturned peripheral flange, a cylindrical ash pit wali sectiondetachably seated on said base plate and engaged by the flange thereof,a grate annulus detachably seated on the ash pit wall section, acylindrical fire box wall section equal in diameter to the ash pit wallsection and detachably seated on the grate annulus. retaining flanges onsaid grate annulus for the wall sections, grate sections carried by saidgrate annulus, and a steam gene 'ating chamber mounted on the fire boxwall section.

In testimony that we claim the foregoing we have hereunto set our handsat Milwaukee, in the county of Milwaukee and State of lVisconsin.

F. G. KELLER. R. A. SHARP.

